How to Pass value between pages using QueryString in Asp.net(C#)

We have two pages Default1.aspx page for pass the value and Default2.aspx for get the value from query string.

<html lang="en">
<head id="Head1" runat="server">
<title>SNJ Diam</title>
</head>
<body>
<form id="form1" runat="server">
<a href="Default2.aspx?Str=Nikhil">Home</a>
</form>
</body>
</html>

Default2.aspx.cs

protected void Page_Load(object sender, EventArgs e)
 {
      if (!IsPostBack)
      {
           if (Request.QueryString["Str"] != null)
           {
               string Str = Request.QueryString["Str"].ToString();
                //here we get value from Str string varriable "Nikhil"
           }
       }
}